package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.common.CustomException;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.stream.Collectors;

@RestController
@RequestMapping("/dish")
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    DishFlavorService dishFlavorService;


    /**
     * 新增菜品
     * @param dishDto  来接收页面提交的数据
     * @return
     */

    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto){


        dishService.savaWithFlavor(dishDto);

        return R.success("新增菜品成功");

    }


    /**
     * 分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){
        //分页构造器对象
        Page<Dish> pageInfo = new Page<>(page,pageSize);
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like(name != null,Dish::getName,name);
        //添加排序条件
        queryWrapper.orderByDesc(Dish::getUpdateTime);

        //执行分页查询
        dishService.page(pageInfo,queryWrapper);

        //对象拷贝
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");
        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) -> {

            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);
            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);

            if(category != null){
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }
            return dishDto;
        }).collect(Collectors.toList());
        dishDtoPage.setRecords(list);

        return R.success(dishDtoPage);
    }






    /**
     * 根据id查询菜品信息和对应的口味信息（回显）
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id){

        //主要方法封装到service中
        DishDto dishDto = dishService.getByIdWithFlavor(id);

        return R.success(dishDto);

    }


    /**
     * 修改菜品
     * @param dishDto
     * @return
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto){

        dishService.updateWithFlavor(dishDto);

        return R.success("修改成功");

    }

    /**
     * 根据条件查询对应的菜品数据
     * @param dish
     * @return
     */
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish){
        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null ,Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus,1);
        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        List<DishDto> dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if(category != null){
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);

            return dishDto;
        }).collect(Collectors.toList());

        return R.success(dishDtoList);
    }

    /**
     * 批量删除菜品和单独删除菜品
     *
     * @param ids
     * @return
     */
    @DeleteMapping
    @Transactional  //因为多表操作开启事务
    public R<String> delete(@RequestParam List<Long> ids) {
        //构造一个条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //判断浏览器传来的ids是否为空，并和菜品表中的id进行匹配
        queryWrapper.in(ids != null, Dish::getId,ids);
        List<Dish> list = dishService.list(queryWrapper);
        for (Dish dish : list) {
            //判断当前菜品是否在售卖阶段，0停售，1起售
            if (dish.getStatus() == 0) {
                //停售状态直接删除
                dishService.removeById(dish.getId());
                LambdaQueryWrapper<DishFlavor> dishFlavorLambdaQueryWrapper = new LambdaQueryWrapper<>();
                //根据菜品id匹配口味表中的菜品id
                dishFlavorLambdaQueryWrapper.eq(DishFlavor::getDishId, dish.getId());
                //删除菜品id关联的口味表信息
                dishFlavorService.remove(dishFlavorLambdaQueryWrapper);
            }else {
                throw new CustomException("此菜品还在售卖阶段，删除影响销售！");
            }
        }
        return R.success("删除成功");
    }

    /**
     * 修改售卖状态（起售，停售）
     * @param status
     * @param ids
     * @return
     */
    @PostMapping("/status/{status}")
    public R<String> statusWithIds(@PathVariable("status") Integer status,@RequestParam List<Long> ids) {
        //构造一个条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(ids != null, Dish::getId, ids);
        queryWrapper.orderByDesc(Dish::getPrice);
        //根据条件进行批量查询
        List<Dish> list = dishService.list(queryWrapper);
        for (Dish dish : list) {
            if (dish != null) {
                //把浏览器传入的status参数赋值给菜品
                dish.setStatus(status);
                dishService.updateById(dish);
            }
        }
        return R.success("售卖状态修改成功");
    }






}
